Kingdom Hearts II is an action role-playing game developed by Square Enix and published by Buena Vista Games and Square Enix in 2005 for the Sony PlayStation 2 video game console. The game is a sequel to the 2002 Disney Interactive and Square collaboration, Kingdom Hearts, which combined Disney and Square elements into an action role-playing game, though it is significantly darker in tone than its predecessor. The game's popularity has resulted in a novel and manga series based upon it and an international version called Kingdom Hearts II Final Mix, released in March 2007.